Bolometer with heat feedback

G - Physics – 01 – J

Patent

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Details

G01J 5/22 (2006.01)

Patent

CA 2698355

The invention relates to a bolometer comprising an outer surface (2) for the thermal absorption of incident radiation in thermal contact with a radiation measurement element (3) having a variable resistance (R) depending on the temperature, the element (3) being in a heat feedback loop (6) comprising a corrector (14) for applying a heating power to a resistive heating means in order to maintain the temperature of the resistor equal to a setpoint temperature (Tref). According to the invention, the resistive heating means comprises the element (3), the corrector (14) is designed to generate a frequency component (S1) of the heating power, which is applied to a coupling means (17) provided between the element (3) and the corrector (14) in order to apply a DC-free signal to the element (3), a coupling means (19), separate from the means (19), is provided between the element (3) and a DC bias means (18) in order to maintain the resistor at a prescribed continuous operation point.

L'invention concerne un bolomètre comportant une surface extérieure (2) d'absorption thermique d'un rayonnement incident en contact thermique avec un élément (3) de mesure du rayonnement à résistance (R) variable en fonction de la température, l'élément (3) se trouvant dans une boucle (6) d'asservissement de chaleur comportant un correcteur (14) d'application d'une puissance de chauffage à un moyen résistif de chauffage pour maintenir la température de la résistance égale à une température (T ref) de consigne. Suivant l'invention, le moyen résistif de chauffage comprend l'élément (3), le correcteur (14) est prévu pour générer une composante fréquentielle (S1) de la puissance de chauffage, qui est appliquée à un moyen (17) de couplage prévu entre l'élément (3) et le correcteur (14) pour appliquer à l'élément (3) un signal sans composante continue, un moyen (19) de couplage, distinct du moyen (19), est prévu entre l'élément (3) et un moyen (18) de polarisation continue pour maintenir la résistance à un point de fonctionnement continu prescrit.

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